Attachment for gramophones.



I s. DAYAN. ATTACHMENT FOR GRAMOPHONES.

APPLICATION FILED DEC-18,1914.

Li, a 1 @G, 1&6 Patented Nov. 16, 1915.

SYLVAIN DAYAN, OF MONTREAL, QUEBEC, CANADA.

ATTACHMENT FOR GRAMOPHONE S.

specification of Letters Patent. V Patented N 1%"19 Application filed December 18, 1914. Serial No. 877,901.

To all whom it may concern: 1

Be it known that I, SY'LVAIN DAYAN, a citizen of the Dominion of Canada, and resident of the city of Montreal, in the Province of Quebec and Dominion of Canada, have invented certain new and useful Improvements in Attachments for Gramophones, of which the following is a full, clear, and exact description.

This invention relates to improvements in attachments for gramophones, and the ob ect 15 to provlde a devlce by means of which any gramoph'one designed to use a steel needle may be equipped with a jeweled needle.

Two types of disk records are manufactured for gramophones, one having lateral undulations in the groove, that is undulations on the side of the groove and the other having undulations in the bottom of the groove. The former type is adapted for steel needles and the latter jeweled needles. It will thus be seen that an entirely diiferent motion is transmitted to the sound box diaphragm by the two types of record, and therefore a sound box adapted for the type of record producing lateral vibrations will not operate if used on a record producing vertical vibrations.

The attachment forming the subject of the present invention is a means for transforming vertical vibrations into lateralvibrations, necessary to a sound box adapted to receive only lateral vibrations.

The device consists essentially of a short arm adapted to be mounted in the needle socket and to extend under the sound box in the same. plane as the sound box diaphragm. This arm carries an offset socket containing the jeweled needle, the offset being such that the movement of theneedle with the undulations of the record imparts a rolling motion to'the arm which is transmitted to the sound box in the proper direction.

In the drawings which illustrate the invention :-Figure 1 is a front elevation of a sound box with the attachment in place. Fig. 2 is a side elevation. Fig. 3 is a plan view of the attachment.

Referring more particularly to the drawings, 5 designates a'sound box of anysuitable design having a diaphragm 6 of mica or other appropriate material, to the center of which one end of a stylus lever 7 is rigidly connected. The opposite end of this lever the sound box.

is rigidly connected to a rocking plate 8,

mounted preferably on knife bearings 9 on A needle socket 10 projects from the opposite side of the plate 8 from the lever 7. hen a steel needle is used,

the lateral movement of the needle is transmitted to' the lever .7, which produces vibration of the diaphragm. It will thus be seen that the needle and lever 7 are for all practical purposes a continuous lever fulcrumed on the bearings 9. Theattachment consists of an arm 11 having at one end thereof a rigid pin 12 adapted to enter the needle socket. This arm may be twisted, as shown at 13, to acquire a maximum ofrigidity.

The pin 12 is mounted in the arm preferably at an angle of 45 thereto, as this is the normal angle of the lever 7 to the record, and the arm 11 is thus held in horizontal position. and carries a clutch or socket 15 at the outer side of the lever, that is, the side remote from the sound box, as clearly shown in Fig. 2. This socket is mounted at an angle of4-5" to the arm, that is to say, parallel with the lever 7, and carries the jewelechneedle 16 in exactly the same relation to the record that a steel needle would be held in the. socket 10. This socket and needle are hereafter referred to as the stylus. A locking screw 17 maybe provided on the .blockl l to permit the'adjustment of the device through the medium of the slot in 11 to different sizes or makes of sound box, so as to bring the point of connection of the stylus and arm sub stantially into the imaginary line 18, which is the axis of oscillation of the stylus lever and needle socket. provided for the stylus point.

In Fig. 3, a diagram is incorporated showing the proper location of the needle. The line A represents the projection of the plane of the diaphragm on the plane of the ,rec-

rection of the arrow X. The arrow point on line A indicates the movement of the- A' block 14 is mounted on the arm A protective cap 19 may be needle relatively to the record. As, however, the recordgrooves are curved, there is a constant force, .line B acting on the needle at right angles to the line A. The proper position of the needle is with'its point on the line .C, which is the bisectrix of the angle between lines A and VVhen-the device is placed in position von a sound box, the pin 12' is inserted in the needle socket, with the bar arranged under the edge of the sound box and in the same plane with the diaphragm, as clearly shown in Figs. 1 and 2, so that the socket 8 projects at the outer side of the sound box, the block being adjusted to bring the needle point on the bisectrix C as. above described, and the block in line with the two bearings 9. The point ofthe needle is thus well under the sound box, so that the tendency to revolve the sound box, marked degree with theordinary steel needle, is practically eliminated. Vertical movement imparted to the needle point from the record is transmitted as a vertical movement through the socket 15 to the block 14:. Owing to the forward extension of the block beyond the arm. the movement has a rocking tendency on the arm. This rocking tendency is, however,- axis of the arm but around the imaginary inclined line passing through the bearings 9 and block. The arm and needle socket thus produce a rocking of the plate 8. which imparts the necessary lateral. motion to the lever 7. There is a certain change in the direction offorces. that is, from the vertical movement of the outer end of the block 14 to an oscillating or rocking, movement around the imaginary inclined axis.

Having thus described my invention, What I claim is 1. T he combination with a diaphragm. a stylus lever, and a needle socket forming the continuationsthereof, of an arm mounted in the needle socket and arranged at an angle Copies of this patent may be obtained for which exists to a' end thereof mounted not around the block mounted flve cents each, by addressing the Washington, D. 0.

of th the stylus lever in substantially the plane of the diaphragm, and a stylus carried by the arm parallel with the stylus lever and out of the plane of the diaphragm.

'2. The combination with a diaphragm, a stylus lever, and a needle socket, of an arm -mounted in the needle/ socket arranged 1n the diaphragm, and a the same plane as stylus carriedzby the arm having its record engaging portion out of the plane of the diaphragm, the point of connection between the stylus and arm being substantially in the same inclined line as the axis of 0scilla ,tion of the stylus lever.

3. The combination with a diaphragm, a stylus lever, and a needle socket, of an arm in the plane of the diaphragm, a pin at one and arrangedat an angle to the arm. a on the arm and proJecting out of the plane of the diaphragm, a stylus on said block parallel with the stylus lever and out of the plane of the diaphragm, and means for permitting, adjustment of said block on the arm to bring its point of corn nection, to said arm substantially into line with the axis of oscillation of the stylus lever.

In witness whereof, I have hereunto set my hand, in the presence oftwo witnesses.

SYLVAIN DAYAN.

Witnesses: y S. R. W. ALLEN,

C. W. TAYLoIl.

Commissioner of Patents,

in the needle socket 

